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# Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

1. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 30,323
09-30-2005, 09:44 AM
1. ### Correlation coefficient and Expected Value

Hi there, I'm doing an introductory statistics course and I'm having a little trouble with one of the questions. I am supposed to find out what...

• Replies: 0
• Views: 1,628
09-15-2015, 10:21 AM
2. ### Correlation coeficient(X,rank(X))

Given a sample of size N from a standard normal, I'd like to compute the correlation coeficient(X,rank(X)). So I need the expected value fo X*F(X)......

• Replies: 3
• Views: 1,946
04-09-2013, 05:09 PM
3. ### correlation matrix

E = integral o to 2i of the exp( ) = 2*pi*exp(i*x1(-m)) likewise for the x2 *x2 case = 2*pi*exp(i*x2*(-m)) For the other two parts E = I am...

• Replies: 1
• Views: 1,388
03-15-2014, 10:56 PM
4. ### Correlation of the product of 2 multivariate normal variables...

hello everyone! i've got a quick theoretical question that i'm gearing towards a simulation exercise but i need to get my stuff right first... ...

• Replies: 12
• Views: 5,967
07-28-2011, 01:33 AM
5. ### Cossing Toins-Probability

If I toss 10 coins, how do I find the probability that 8 of them will land on heads? Could someone help me out?

• Replies: 11
• Views: 2,986
10-08-2008, 10:14 AM
6. ### cost estimating with probability

i'm trying to do a quick cost estimation using this monte carlo program to see how it works but i'm also trying to factor in different types of risk...

• Replies: 0
• Views: 4,094
08-19-2008, 05:14 PM

I posted the entire question earlier in the thread and I would greatly appreciate it if someone would help me and show me how to do the problem step...

• Replies: 0
• Views: 1,801
09-17-2007, 11:38 PM
8. ### Could someone please help? Probability of sampling error?

This is one concept I cannot understand. I'm studying for a test and loathe the probability chapter. Here is the problem and I following all of the...

• Replies: 12
• Views: 5,618
04-15-2012, 06:45 AM
9. ### Could you help me out with this function please?

Hello everyone. I am currently working with this stochastic function in a dynamic model simulation: N(t) such that N(0)=1 In every time step...

• Replies: 3
• Views: 2,125
BGM
03-19-2013, 08:25 AM
10. ### count of integers in sliding window

Hi all, I'm looking to generate a series of integers in the range , that start off with a large spacing, like 2 50 101, etc. At a peak of some...

• Replies: 11
• Views: 5,654
02-26-2010, 06:29 AM
11. ### Counting methods

Hello, So I have a question that I thought I did right but in reality, was wrong. The question goes as followed: Suppose I give you a list of 20...

• Replies: 0
• Views: 3,310
ssx
10-04-2015, 08:20 PM
12. ### counting probability

i need some help counting probability using Bayes theorem given that 1/10 of message is a spam message. spam detector will correct identify a...

• Replies: 5
• Views: 2,095
07-28-2013, 09:27 AM
13. ### Counting probability given the mean and standard deviation

Hi all :-) I'm trying to find solution to the following problem, could anyone please help ? In response to the increasing weight of airline...

• Replies: 3
• Views: 6,529
01-17-2012, 04:23 PM
14. ### counting problem?

A closet contains 6 diﬀerent pairs of shoes. Five shoes are drawn at random. What is the probability that at least one pair of shoes is obtained?

• Replies: 2
• Views: 1,266
11-11-2013, 05:48 PM
15. ### Counting problem?

NOW SOLVED. SPECIAL THANKS TO rogojel and con-tester. This is probably a simple problem, but I have been through my 8 counting rules about different...

• Replies: 3
• Views: 1,558
07-22-2015, 10:55 AM
16. ### Counting question

Hey, I am not able to find the number of combination when I have 100 varaibles... with 2, I have: AB: A - B - AB = 3 combinations with 3, I...

• Replies: 2
• Views: 3,213
06-04-2008, 08:53 PM
17. ### Counting question

A bit of an odd problem because I was just doing this out of curiosity while helping a friend with this. I have a hat with 5 cards in it. I want...

• Replies: 2
• Views: 2,261
c2q
03-27-2011, 10:12 PM
18. ### Counting Question

Question: If I had X number of train cars and I wanted to know the probability of having Y or more people in a car when I have N total of people. How...

• Replies: 1
• Views: 1,278
BGM
09-30-2013, 06:47 AM
19. ### Counting question

4 selections of single digits are made at random with replacement, from the 10 digits 0-9. Find the probability that these sum to 20. I thought...

• Replies: 1
• Views: 1,182
03-10-2015, 02:24 AM
20. ### counting rule questions

Consider 5 card poker hands dealt from a 52 card deck. two important events are: A(you draw a flush), B(you draw a straight). Q: find P(A)? find...

• Replies: 0
• Views: 2,600
new
07-29-2006, 04:55 PM
21. ### counting rule?

20 students have to be split into 5 different labs groups; how many ways can we partition them if the first 3 labs have 3 students, the 4th has 5...

• Replies: 15
• Views: 6,176
09-20-2010, 10:52 AM
22. ### counting rules

"A fleet of ten taxis is to be dispatched to three locations in such a way that three taxis go to the first location, five taxis go to the second...

• Replies: 3
• Views: 3,904
09-21-2006, 06:51 AM
23. ### Counting rules.

Hi, Can someone please explain to me why the answer to this question is as written? Suppose we deal four 13-card bridge hands from an ordinary...

• Replies: 9
• Views: 6,803
09-26-2010, 08:20 PM
24. ### counting tree?

Here is a problem I need help with: A USA Today national survey of heads of households found that 24% of women had asked for a raise, and of those...

• Replies: 2
• Views: 3,483
04-18-2009, 02:33 PM
25. ### Covariance of a linear comb. of independent variables

U = y1 - 2y2 + y3 W = 3y1 + y2 E = 1, E = 2, E = -1, Var = 1, Var = 3, Var = 5 Var(U) = 12, Var(W) = 12 ;I hope y1, y2, y3 are Independent RV's...

• Replies: 2
• Views: 1,748
10-18-2012, 10:48 PM
26. ### Covariance of random balls

Hi, would appreciate any comments: I have: 10 balls with number 6 on each, 10 balls with n. 7, 10 balls with n. 8. So it's 30 balls in...

• Replies: 2
• Views: 2,025
07-09-2011, 06:17 PM
27. ### Covariance of unconditional density

I do have a minor problem with a simple covariance matrix. Let x be a first order Markov chain of length n defined by the transition matrix P,...

• Replies: 0
• Views: 1,071
09-29-2015, 04:39 AM
28. ### Covariance question without using integrals

Hello, I am trying to figure out a way to do the following question without using integrals. X is distributed as Unif with Y=-log(X). Find...

• Replies: 4
• Views: 2,454
11-18-2012, 01:51 AM
29. ### Craps Probability

I was a math major at Johns Hopkins, but for some reason this is giving me trouble. I want to know the probability of rolling EITHER a 4, 5, 9, or...

• Replies: 3
• Views: 1,849
BGM
04-15-2012, 05:36 AM
30. ### Crazy union/intersection question.

Paul will be taking three exams - call them A, B and C. You are given: -It is certain that he will pass at least one exam. -The probability that...

• Replies: 1
• Views: 2,862
02-05-2007, 12:17 PM
31. ### Create Probability Table!

I need help with this question, I can't figure it out for the life of me! I mostly need help setting it up in a table! PLEASE EXPLAIN YOUR PROCESS...

• Replies: 3
• Views: 1,247
01-17-2013, 06:07 PM
32. ### Creating a joint probability table

I need help figuring out how to create this joint probability table 43 million people in the United States go without health insurance. Sample...

• Replies: 3
• Views: 19,062
09-03-2009, 09:58 PM
33. ### creating conditional probability distribution

I have a system which visits two locations and collects signals every 10 seconds. It is well known that A causes B to occur but not all the time. So,...

• Replies: 0
• Views: 2,013
02-03-2013, 05:19 PM
34. ### creating sten scores

Hi, Please can someone help me out with creating a sten score - I am unsure of the process to follow to do this - is it something that can be...

• Replies: 0
• Views: 6,016
03-20-2006, 12:01 AM
35. ### Credit Card Probability

Last year 75% of Kmart Department Stores credit card purchases were for less than \$150. In a random sample of 200 credit card companies, what is the...

• Replies: 2
• Views: 4,437
12-05-2010, 08:03 PM
36. ### Credit Card Roulette - Expected Value

4 people just finished dinner and the bill arrives. The total tab is \$100. When paying for the bill what is better (for the individual): (1) split...

• Replies: 1
• Views: 4,639
06-16-2008, 04:08 PM
37. ### Crews of 3

There are 25 machinists employeed by a company a. if a night crew consists of 3 machinists, how many different crews are possible. (is this a...

• Replies: 0
• Views: 2,687
07-10-2009, 01:17 PM
38. ### cross corealtion matrix

Hi can any body help that how can we calculate a cross correlation matrix coeff in real time uzmeed

• Replies: 0
• Views: 2,335
04-18-2011, 05:45 AM
39. ### cross term

The book says that the following cross term can be shown to be zero by iterating the expectation: E. What does it mean "to iterate the...

• Replies: 1
• Views: 1,041
10-28-2013, 09:52 AM
40. ### Crying inside 😖 just can't quite get probability

I'm taking stats online and this unit is on probability. I'm having a terrible time understanding it. The conditional probability rule is where I'm...

• Replies: 0
• Views: 18,960
06-29-2015, 03:03 AM
41. ### cumulants

I don't know much about cumulants. What I know is that they can be generated by using the cumulant generating function g(t) = \log(E). I'm studying...

• Replies: 1
• Views: 1,968
BGM
08-29-2013, 12:54 AM
42. ### Cumulative Beta Distribution Function Help

Hi everyone, I was wondering if someone could help me figure out how this function works. My problem is not that I need homework help, it's that...

• Replies: 13
• Views: 12,641
05-05-2014, 04:07 AM
43. ### Cumulative combinations

I wish to determine the probability of a team winning AT LEAST eight of its next ten games. I understand that 10C8 will tell me the probability of...

• Replies: 5
• Views: 4,566
07-04-2010, 10:12 AM
44. ### Cumulative Distribution

Can anyone explain how to do this problem: Let X be a random variable uniformly distributed in the interval (0, 1). Find the cumulative distribution...

• Replies: 2
• Views: 1,685
11-09-2014, 06:25 PM
45. ### Cumulative Distribution Function

Please help me, I have 2 cases: 1. n is positive constant and defined by function f(x)=1/2.n.e^(-n.x) if x>=0 and f(x)=1/2.n.e^(-n.x) if x<0....

• Replies: 8
• Views: 10,209
10-26-2010, 01:37 AM
46. ### cumulative distribution function for error

Hi, I need help regarding the generation of cumulative distribution function (CDF) for distance error. I have a system which calculates...

• Replies: 9
• Views: 6,284
03-04-2011, 12:06 AM
47. ### Cumulative distribution function help!

Hey, I'm new here. I'm stuck with this problem. Will post what I've tried to do. Hopefully someone can provide hints to help me out. Thanks. If Z...

• Replies: 1
• Views: 3,688
03-16-2009, 12:58 PM
48. ### cumulative distribution function of a uniform distribution

I just need some help on the question below. Bacteria are grown in a dish for a length of time (in hours) T which is a random variable with a...

• Replies: 1
• Views: 1,555
BGM
10-30-2012, 10:17 AM
49. ### Cumulative distribution help.

Okay so I've got this question: Let X be a random variable with a cumulative distribution function Fx. Prove that P(x=a) = 0 if and only if Fx is...

• Replies: 11
• Views: 6,003
10-11-2010, 06:25 PM
50. ### Cup and ball game: what are the odds of that?

OK we are having an intelectual discussion (no, really) about the change in odds during the classic cup and ball game. To explain: a dealer has...

• Replies: 2
• Views: 12,597
02-22-2010, 08:00 PM
51. ### Customer Retention Probability

I'm not a statistician so forgive my ignorance. Here's what I'm trying to do: I have a list of all customers active and cancelled. I have tables...

• Replies: 2
• Views: 1,539
06-19-2014, 01:27 AM
52. ### customer service problem

N customers circulate in a closed system with two servers. In Server 1 and Server 2, service times are exponential with parameters µ1 and µ2,...

• Replies: 0
• Views: 897
04-17-2012, 09:12 PM
53. ### Cycle of permutation Problem

Dear everyone, I have questions about cycle of permutation. Here are the questions. For ones who haven't heard about cycle, Anyway, I...

• Replies: 3
• Views: 4,820
01-30-2012, 01:04 AM
54. ### D&D GM Needs Help Calculating Stat-Upgrades

Hello! I've never taken a stat class, so bear with me if this seems basic. I have searched for a while for a solution to this, but nothing has been...

• Replies: 3
• Views: 1,175
02-18-2015, 12:45 AM
55. ### Darts probabilty

when we throw a dart at a target, we have a probability of 1/4 of hitting the target . what is the probability of obtaining at least one hit if three...

• Replies: 1
• Views: 1,626
BGM
09-25-2011, 07:49 AM
56. ### Moved: Data Entry

• Replies: -
• Views: -
BGM
02-15-2013, 01:22 PM
57. ### de Morgan's law

I need help. I just can't figure out where to go with this one.. For two events A and B show that: P(A intersection B) is greater than or...

• Replies: 1
• Views: 4,823
09-02-2008, 03:12 AM

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